COURSE of the MONTH

HTML LANGUAGES & SCRIPTS

1) What all languages and scripts can work within HTML either as part of it OR a call to them.
2) What activities can we perform with them.
3) For ex. JavaScript is used as part of it mainly for validations and what else?
4) What types of graphics, images, audio & video do browsers support and the programs used to generate them are required to be installed to view/hear.